diff --git a/CHANGELOG.md b/CHANGELOG.md
index bf9881c..042b8f6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,16 @@
 # CHANGELOG
 
+## 1.3 / not released
+
+* Added \nspl\a\lazy which contains lazy versions of function from \nspl\a where it made sense
+* Added \nspl\a\in which works both on arrays and traversable objects
+* Added \nspl\a\keys which works both on arrays and traversable objects
+* Added \nspl\a\dropKeys which works both on arrays and traversable objects
+* Added \nspl\a\diff which works both on arrays and traversable objects
+* Added \nspl\a\intersect which works both on arrays and traversable objects
+* Added \nspl\rnd\randomString
+* Added \nspl\f\throttled higher order function
+
 ## 1.2 / 2017-01-05
 
 * Made ```\nspl\args``` PHP 7 compatible
diff --git a/README.md b/README.md
index c5ded72..78099ac 100644
--- a/README.md
+++ b/README.md
@@ -141,9 +141,9 @@ $pairs = a\zip([1, 2, 3], ['a', 'b', 'c']);
     * [reorder](#reorderarray-list-from-to)
     * [value](#valuearray-key-default--null)
     * [keys](#keyssequence)
-    * [in](#initem-collection)
-    * [diff](#diffcollction1-collection2)
-    * [intersect](#diffcollction1-collection2)
+    * [in](#initem-sequence)
+    * [diff](#diffcollction1-sequence2)
+    * [intersect](#diffcollction1-sequence2)
     * [isList](#islistvar)
     * [Callbacks](#callbacks-2)
 * [nspl\a\lazy](#nsplalazy)
@@ -655,21 +655,21 @@ Returns list of the sequence keys
 assert(['a', 'b', 'c'] === keys(array('a' => 1, 'b' => 2, 'c' => 3)));
 ```
 
-##### in($item, $collection)
+##### in($item, $sequence)
 
 Checks if the item is preset in array or traversable object
 ```php
 assert(true === in(1, [1, 2, 3]);
 ```
 
-##### diff($collection1, $collection2)
+##### diff($sequence1, $sequence2)
 
 Computes the difference of arrays or traversable objects
 ```php
 assert([1] === diff([1, 2, 3], new ArrayObject([2, 3, 4]));
 ```
 
-##### intersect($collection1, $collection2)
+##### intersect($sequence1, $sequence2)
 
 Computes the intersection of arrays or traversable objects
 ```php
diff --git a/index.md b/index.md
index c5ded72..78099ac 100644
--- a/index.md
+++ b/index.md
@@ -141,9 +141,9 @@ $pairs = a\zip([1, 2, 3], ['a', 'b', 'c']);
     * [reorder](#reorderarray-list-from-to)
     * [value](#valuearray-key-default--null)
     * [keys](#keyssequence)
-    * [in](#initem-collection)
-    * [diff](#diffcollction1-collection2)
-    * [intersect](#diffcollction1-collection2)
+    * [in](#initem-sequence)
+    * [diff](#diffcollction1-sequence2)
+    * [intersect](#diffcollction1-sequence2)
     * [isList](#islistvar)
     * [Callbacks](#callbacks-2)
 * [nspl\a\lazy](#nsplalazy)
@@ -655,21 +655,21 @@ Returns list of the sequence keys
 assert(['a', 'b', 'c'] === keys(array('a' => 1, 'b' => 2, 'c' => 3)));
 ```
 
-##### in($item, $collection)
+##### in($item, $sequence)
 
 Checks if the item is preset in array or traversable object
 ```php
 assert(true === in(1, [1, 2, 3]);
 ```
 
-##### diff($collection1, $collection2)
+##### diff($sequence1, $sequence2)
 
 Computes the difference of arrays or traversable objects
 ```php
 assert([1] === diff([1, 2, 3], new ArrayObject([2, 3, 4]));
 ```
 
-##### intersect($collection1, $collection2)
+##### intersect($sequence1, $sequence2)
 
 Computes the intersection of arrays or traversable objects
 ```php
diff --git a/nspl/a.php b/nspl/a.php
index 86f8776..a312902 100644
--- a/nspl/a.php
+++ b/nspl/a.php
@@ -866,22 +866,22 @@ function isList($var)
  * Checks if the item is preset in array or traversable object
  *
  * @param mixed $item
- * @param array|\Traversable $collection
+ * @param array|\Traversable $sequence
  * @return mixed
  */
-function in($item, $collection)
+function in($item, $sequence)
 {
-    if (is_array($collection)) {
-        return in_array($item, $collection);
+    if (is_array($sequence)) {
+        return in_array($item, $sequence);
     }
 
-    if (method_exists($collection, 'toArray')) {
-        return in_array($item, $collection->toArray());
+    if (method_exists($sequence, 'toArray')) {
+        return in_array($item, $sequence->toArray());
     }
 
-    args\expects(args\traversable, $collection);
-    foreach ($collection as $collectionItem) {
-        if ($collectionItem === $item) {
+    args\expects(args\traversable, $sequence);
+    foreach ($sequence as $sequenceItem) {
+        if ($sequenceItem === $item) {
             return true;
         }
     }
@@ -893,30 +893,30 @@ function in($item, $collection)
 /**
  * Computes the difference of arrays or traversable objects
  *
- * @param array|\Traversable $collection1
- * @param array|\Traversable $collection2
+ * @param array|\Traversable $sequence1
+ * @param array|\Traversable $sequence2
  * @return array
  */
-function diff($collection1, $collection2)
+function diff($sequence1, $sequence2)
 {
-    if (is_array($collection1)) {
-        $toDiff1 = $collection1;
+    if (is_array($sequence1)) {
+        $toDiff1 = $sequence1;
     }
-    else if (method_exists($collection1, 'toArray')) {
-        $toDiff1 = $collection1->toArray();
+    else if (method_exists($sequence1, 'toArray')) {
+        $toDiff1 = $sequence1->toArray();
     }
     else {
-        $toDiff1 = iterator_to_array($collection1);
+        $toDiff1 = iterator_to_array($sequence1);
     }
 
-    if (is_array($collection2)) {
-        $toDiff2 = $collection2;
+    if (is_array($sequence2)) {
+        $toDiff2 = $sequence2;
     }
-    else if (method_exists($collection2, 'toArray')) {
-        $toDiff2 = $collection2->toArray();
+    else if (method_exists($sequence2, 'toArray')) {
+        $toDiff2 = $sequence2->toArray();
     }
     else {
-        $toDiff2 = iterator_to_array($collection2);
+        $toDiff2 = iterator_to_array($sequence2);
     }
 
     return array_diff($toDiff1, $toDiff2);
@@ -926,30 +926,30 @@ function diff($collection1, $collection2)
 /**
  * Computes the intersection of arrays or traversable objects
  *
- * @param array|\Traversable $collection1
- * @param array|\Traversable $collection2
+ * @param array|\Traversable $sequence1
+ * @param array|\Traversable $sequence2
  * @return array
  */
-function intersect($collection1, $collection2)
+function intersect($sequence1, $sequence2)
 {
-    if (is_array($collection1)) {
-        $toDiff1 = $collection1;
+    if (is_array($sequence1)) {
+        $toDiff1 = $sequence1;
     }
-    else if (method_exists($collection1, 'toArray')) {
-        $toDiff1 = $collection1->toArray();
+    else if (method_exists($sequence1, 'toArray')) {
+        $toDiff1 = $sequence1->toArray();
     }
     else {
-        $toDiff1 = iterator_to_array($collection1);
+        $toDiff1 = iterator_to_array($sequence1);
     }
 
-    if (is_array($collection2)) {
-        $toDiff2 = $collection2;
+    if (is_array($sequence2)) {
+        $toDiff2 = $sequence2;
     }
-    else if (method_exists($collection2, 'toArray')) {
-        $toDiff2 = $collection2->toArray();
+    else if (method_exists($sequence2, 'toArray')) {
+        $toDiff2 = $sequence2->toArray();
     }
     else {
-        $toDiff2 = iterator_to_array($collection2);
+        $toDiff2 = iterator_to_array($sequence2);
     }
 
     return array_intersect($toDiff1, $toDiff2);